The transmitter and receiver of reflective photoelectric switch are on the same side. The transmitter sends out a light beam, which is received by the receiver after being reflected by an object. When the intensity of reflected light changes, it is judged whether the object exists. It is convenient to install and occupies little space.

Application: in the vending machine, detect whether the goods fall; In the elevator door system, whether there are obstacles between the doors is detected; It is also applied to the detection of vehicles in and out of parking lots and the identification of vehicle positions.